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    SubjectRe: [PATCH -mm] DC395x SCSI driver: Shut up uninitialized variable build warning
    Satyam Sharma wrote:
    > drivers/scsi/dc395x.c: In function ‘dc395x_init_one’:
    > drivers/scsi/dc395x.c:4272: warning: ‘ptr’ may be used uninitialized in this function
    > has been verified to be a bogus warning. Let's shut it up.
    > Signed-off-by: Satyam Sharma <>
    > ---
    > drivers/scsi/dc395x.c | 2 +-
    > 1 file changed, 1 insertion(+), 1 deletion(-)
    > --- linux-2.6.23-rc4-mm1/drivers/scsi/dc395x.c~fix 2007-09-02 20:57:51.000000000 +0530
    > +++ linux-2.6.23-rc4-mm1/drivers/scsi/dc395x.c 2007-09-02 21:10:49.000000000 +0530
    > @@ -4269,7 +4269,7 @@ static int __devinit adapter_sg_tables_a
    > const unsigned srbs_per_page = PAGE_SIZE/SEGMENTX_LEN;
    > int srb_idx = 0;
    > unsigned i = 0;
    > - struct SGentry *ptr;
    > + struct SGentry * uninitialized_var(ptr);

    For things like this, we need to see (perhaps a separate email in the
    same thread) your build details: config, arch, compiler version, etc.

    This warning does not appear on x86 or x86-64 here, with the current
    version of gcc. And I'm not so sure we want to be adding these markers
    for older versions of the compiler, or for what is ultimately a
    temporary [situation | configuration] in the grand scheme of things.

    I paid careful attention to my recent set of uninitialized_var() markers
    (now upstream), making sure that they persisted across several compiler
    versions, ensuring the warning was not a temporary optimizer bug quickly

    I hope to encourage similar diligence in others :) These markers have
    the very-real potential downside of hiding bugs, so they should be used


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      Last update: 2007-09-02 22:27    [W:0.020 / U:63.048 seconds]
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